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gh-159739: Preserve CJK codec state across chunk boundaries and callbacks - #160400
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… callbacks The HZ encoder can consume a tilde after writing only its first escape byte. A split ISO-2022 escape can exceed the incremental decoder’s pending buffer, and a reset can leave the previous character set selected. Reserve space for both HZ bytes before consuming the tilde, allow the full pending escape, and restore the initial ISO-2022 state on reset. Keep the native codec table and the active encoder error policy alive so replacing their Python owners cannot leave a codec using freed memory.
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The HZ encoder can consume a tilde after writing only its first escape byte. A split ISO-2022 escape can exceed the incremental decoder’s pending buffer, and a reset can leave the previous character set selected. Reserve space for both HZ bytes before consuming the tilde, allow the full pending escape, and restore the initial ISO-2022 state on reset. Keep the native codec table and the active encoder error policy alive so replacing their Python owners cannot leave a codec using freed memory.